Dead4W / jsAesCrypt

(function () {

    // Shortcuts

    var C = CryptoJS;

    var C_lib = C.lib;

    var WordArray = C_lib.WordArray;

    var C_enc = C.enc;

    /**

     * UTF-16 BE encoding strategy.

     */

    var Utf16BE = C_enc.Utf16 = C_enc.Utf16BE = {

        /**

         * Converts a word array to a UTF-16 BE string.

         *

         * @param {WordArray} wordArray The word array.

         *

         * @return {string} The UTF-16 BE string.

         *

         * @static

         *

         * @example

         *

         *     var utf16String = CryptoJS.enc.Utf16.stringify(wordArray);

         */

        stringify: function (wordArray) {

            // Shortcuts

            var words = wordArray.words;

            var sigBytes = wordArray.sigBytes;

            // Convert

            var utf16Chars = [];

            for (var i = 0; i < sigBytes; i += 2) {

                var codePoint = (words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff;

                utf16Chars.push(String.fromCharCode(codePoint));

            }

            return utf16Chars.join('');

        },

        /**

         * Converts a UTF-16 BE string to a word array.

         *

         * @param {string} utf16Str The UTF-16 BE string.

         *

         * @return {WordArray} The word array.

         *

         * @static

         *

         * @example

         *

         *     var wordArray = CryptoJS.enc.Utf16.parse(utf16String);

         */

        parse: function (utf16Str) {

            // Shortcut

            var utf16StrLength = utf16Str.length;

            // Convert

            var words = [];

            for (var i = 0; i < utf16StrLength; i++) {

                words[i >>> 1] |= utf16Str.charCodeAt(i) << (16 - (i % 2) * 16);

            }

            return WordArray.create(words, utf16StrLength * 2);

        }

    };

    /**

     * UTF-16 LE encoding strategy.

     */

    C_enc.Utf16LE = {

        /**

         * Converts a word array to a UTF-16 LE string.

         *

         * @param {WordArray} wordArray The word array.

         *

         * @return {string} The UTF-16 LE string.

         *

         * @static

         *

         * @example

         *

         *     var utf16Str = CryptoJS.enc.Utf16LE.stringify(wordArray);

         */

        stringify: function (wordArray) {

            // Shortcuts

            var words = wordArray.words;

            var sigBytes = wordArray.sigBytes;

            // Convert

            var utf16Chars = [];

            for (var i = 0; i < sigBytes; i += 2) {

                var codePoint = swapEndian((words[i >>> 2] >>> (16 - (i % 4) * 8)) & 0xffff);

                utf16Chars.push(String.fromCharCode(codePoint));

            }

            return utf16Chars.join('');

        },

        /**

         * Converts a UTF-16 LE string to a word array.

         *

         * @param {string} utf16Str The UTF-16 LE string.

         *

         * @return {WordArray} The word array.

         *

         * @static

         *

         * @example

         *

         *     var wordArray = CryptoJS.enc.Utf16LE.parse(utf16Str);

         */

        parse: function (utf16Str) {

            // Shortcut

            var utf16StrLength = utf16Str.length;

            // Convert

            var words = [];

            for (var i = 0; i < utf16StrLength; i++) {

                words[i >>> 1] |= swapEndian(utf16Str.charCodeAt(i) << (16 - (i % 2) * 16));

            }

            return WordArray.create(words, utf16StrLength * 2);

        }

    };

    function swapEndian(word) {

        return ((word << 8) & 0xff00ff00) | ((word >>> 8) & 0x00ff00ff);

    }

}());